Iceland generates 30% of its electricity from geothermal power. It sits conveniently on top of the constructive plate margin, between the European and North American tectonic plates. This active volcanic region has geothermal activity at the surface, the steam from which can be harnessed to drive steam turbines. In the UK we are experimenting with drilling geothermal boreholes, to access hot water for space heating. This is not a renewable energy source that all countries could utilize, but where geothermal activity is close to the surface, it is an option.